Sound box stress testing device and testing method thereof

Abstract

The embodiment of the present application relates to the field of sound box testing, and discloses a sound box stress testing device and a testing method thereof.The sound box stress testing device comprises a fixing device, at least one acceleration sensor and a processing module; the fixing device is used for bearing a sound box to be tested, so that the sound box to be tested is in a free state in a non-working state; the at least one acceleration sensor is fixed on the fixing device and / or the sound box to be tested borne by the fixing device, and is used for acquiring the acceleration of each acceleration sensor of the sound box to be tested in a working state; the processing module is connected with the acceleration sensor, and is used for determining the acceleration of the sound box to be tested according to the acceleration of each acceleration sensor, and acquiring the acting force on the sound box to be tested according to the acceleration of the sound box to be tested, the mass of the sound box to be tested and the mass of the fixing device. The present application inversely calculates the acting force on the sound box to be tested by acquiring the acceleration of the sound box to be tested, is fast and accurate, and ensures the synchronism of data in each direction.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of sound box testing, and particularly relate to a sound box force testing device and a testing method thereof. BACKGROUND

[0002] A sound box is a terminal of an entire sound system, and functions to convert audio electric energy into corresponding sound energy and radiate it to space. The sound box is an extremely important component of the sound system, and is responsible for the task of converting electric signals into sound signals for the ears of people to directly listen to. When evaluating the sound effect of the sound box, since electronic devices such as a driving motor, a transformer magnetic induction, and a loudspeaker in the sound box generate vibrations when working, and then generate action forces in different directions on the sound box, the sound box appears unstable phenomena such as rotation and movement, which affects the evaluation of the sound effect of the sound box. Therefore, it is necessary to accurately test the action forces in different directions on the sound box in a working state.

[0003] A commonly used sound box force testing method is to establish an equivalent simulation model of the sound box, and to obtain the action forces in different directions through simulation calculation. However, the accuracy of the simulation calculated action forces is limited by the equivalent way of the model, and there is still a difference from the real test data, and the accuracy is low. SUMMARY

[0004] Embodiments of the present application aim to provide a sound box force testing device and a testing method thereof. The acceleration of a to-be-tested sound box in a working state is measured by at least one acceleration sensor arranged on a fixing device and / or the to-be-tested sound box, and the action force on the to-be-tested sound box is obtained through reverse calculation. The action forces in multiple directions are obtained through one test, which is fast and accurate, and ensures the synchronicity of the data in different directions.

[0005] To solve the above technical problems, embodiments of the present application provide a sound box force testing device, a fixing device, at least one acceleration sensor, and a processing module. The fixing device is used to carry a to-be-tested sound box, so that the to-be-tested sound box is in a free state in a non-working state. The at least one acceleration sensor is fixed on the fixing device and / or the to-be-tested sound box carried by the fixing device, and is used to obtain the acceleration of each acceleration sensor of the to-be-tested sound box in a working state. The processing module is connected with the acceleration sensor, and is used to determine the acceleration of the to-be-tested sound box according to the acceleration of each acceleration sensor, and to obtain the action force on the to-be-tested sound box according to the acceleration of the to-be-tested sound box, the mass of the to-be-tested sound box, and the mass of the fixing device.

[0006] The embodiment of the present application also provides an audio box stress test method, which is applied to the audio box stress test device as described in the above embodiment, and the method comprises the following steps: when the to-be-tested audio box is placed on the test device and the to-be-tested audio box is in a working state, obtaining the acceleration measured by at least one acceleration sensor in the test device; determining the acceleration of the to-be-tested audio box according to the acceleration measured by the at least one acceleration sensor, and obtaining the acting force on the to-be-tested audio box according to the acceleration of the to-be-tested audio box, the mass of the to-be-tested audio box and the mass of the fixing device.

[0007] The audio box stress test device provided by the embodiment of the present application can make the to-be-tested audio box in a free state without acting force or with a resultant force of zero in a non-working state. In the free state, the acceleration measured by each acceleration sensor when the to-be-tested audio box is working can be obtained through at least one acceleration sensor installed on the fixing device and / or the to-be-tested audio box. In the free state, the acceleration and the acting force are related to each other. Therefore, the processing module can obtain the acting force on the to-be-tested audio box through reverse calculation according to the acceleration of the to-be-tested audio box, the mass of the to-be-tested audio box and the mass of the fixing device. The acting force in multiple directions can be obtained through one test, which is fast and accurate and ensures the synchronism of the data in each direction. BRIEF DESCRIPTION OF DRAWINGS

[0008] One or more embodiments are illustrated by way of example in the drawings in which like reference numerals indicate like elements, and in which: the drawings are not necessarily to scale, unless otherwise specifically noted.

[0009] Figure 1 is a structural schematic diagram of the audio box stress test device provided by the embodiment of the present application Figure 1 ;

[0010] Figure 2 is a structural schematic diagram of the audio box stress test device provided by the embodiment of the present application Figure 2 ;

[0011] Figure 3 is a flowchart of the audio box stress test method provided by the embodiment of the present application. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, the technical scheme claimed by the present application can be realized even without these technical details and various changes and modifications based on the following embodiments.

[0013] The implementation details of the sound box stress testing device and the testing method thereof in the present embodiment are illustrated below. The following implementation details are provided for the convenience of understanding and are not essential for implementing the present solution.

[0014] The present embodiment relates to a sound box stress testing device, as shown in Figure 1 which comprises a fixing device 101, at least one acceleration sensor 102 and a processing module 103.

[0015] The fixing device 101 is used to carry the sound box to be tested, so that the sound box to be tested is in a free state in a non-working state. Specifically, the free state means that the sound box to be tested is not subjected to an external force or the resultant force of the external force is always zero in the non-working state.

[0016] It should be noted that Figure 1 The fixing device 101 shown in the figure is only a schematic diagram, and the present application does not limit the specific structure and material of the fixing device. As long as the sound box to be tested can be in a free state in a non-working state, it is acceptable. For example, the fixing device can be a rod, a string, a spring, or a combination of a rod and a support plate, a combination of a string and a storage box, a combination of a rod and a storage box, a combination of a spring and a support plate, etc.

[0017] The at least one acceleration sensor 102 is fixed to the fixing device 101 and / or the sound box to be tested carried by the fixing device 101, and is used to obtain the acceleration of each acceleration sensor when the sound box to be tested is in a working state.

[0018] Specifically, the present embodiment does not limit the fixed position and fixed manner of the acceleration sensor 101. The acceleration sensor can be fixed to the fixing device 101, or fixed to the sound box to be tested, or placed on both the fixing device 101 and the sound box to be tested. The fixed manner can be a detachable fixed manner or an integral fixed manner. In an embodiment, the at least one acceleration sensor is fixed to the fixing device 101 and / or the sound box to be tested carried by the fixing device 101 by any one of a magnetic element, a buckle and glue.

[0019] The processing module 103 is connected with the acceleration sensor 102, and is used to determine the acceleration of the sound box to be tested according to the acceleration of each acceleration sensor 102, and to obtain the external force acting on the sound box to be tested according to the acceleration of the sound box to be tested, the mass of the sound box to be tested and the mass of the fixing device 101.

[0020] Specifically, the processing module 103 and the acceleration sensor 102 can be physically electrically connected or communicatively connected (e.g., Bluetooth connection), and the processing module 103 is configured to acquire the acceleration of the to-be-tested sound box, and acquire the force acting on the to-be-tested sound box based on Newton's second law according to the acceleration of the to-be-tested sound box, the mass of the to-be-tested sound box, and the mass of the fixing device 101. In addition, the acceleration sensor in the embodiment can be a three-way acceleration sensor (which can directly acquire the acceleration values in each direction) or a common acceleration sensor (which needs to decompose the acceleration values acquired by the acceleration sensor to acquire the acceleration values in each direction).

[0021] The sound box force testing device provided in the application can make the to-be-tested sound box in a free state without force or with a resultant force of zero in a non-working state through the fixing device. In the free state, the acceleration measured by each acceleration sensor during the working of the to-be-tested sound box can be acquired through at least one acceleration sensor installed on the fixing device and / or the to-be-tested sound box. In the free state, the acceleration and the force are related to each other. Therefore, the processing module can acquire the force acting on the to-be-tested sound box through reverse calculation based on the acceleration of the to-be-tested sound box, the mass of the to-be-tested sound box, and the mass of the fixing device. The force in multiple directions can be acquired through one test, which is fast and accurate and ensures the synchronicity of the data in each direction.

[0022] Another embodiment of the application relates to a sound box force testing device. The embodiment is an improvement of the foregoing embodiment, and the improvement lies in that the setting position of the acceleration sensor and the structure of the fixing device are supplemented.

[0023] In an embodiment, as shown in Figure 2 The fixing device 101 includes a bearing frame 1011, an elastic element 1012, and a base 1013. The bearing frame 1011 is fixed to the base 1013 in a free state through the elastic element 1012, and the to-be-tested sound box is fixed to the bearing frame 1011.

[0024] In the embodiment, the bearing frame 1011 is fixed to the base 1013 through the elastic element 1012, so that the to-be-tested sound box placed on the bearing frame is in a free state. The shape and structure of the bearing frame 1011 are not limited to Figure 2 As shown in Figure 2 As shown in

[0025] Further, the stiffness of the elastic element 1012 is positively correlated with the natural frequency and the mass of the sound box force testing device. The natural frequency of the sound box force testing device in the vertical direction is less than 1 / 4 of the frequency of the signal emitted by the to-be-tested sound box. The natural frequency of the testing device in directions other than the vertical direction is less than 1 / 10 of the frequency of the signal emitted by the to-be-tested sound box.

[0026] Specifically, the relationship among the natural frequency f of the testing device, the mass m of the testing device and the stiffness k of the elastic element is expressed as:

[0027]

[0028] The natural frequency f of the testing device in the vertical direction is less than 1 / 4 of the signal frequency of the speaker to be tested, and the natural frequency of the testing device in other directions is less than 1 / 10 of the signal frequency of the speaker to be tested. The signal frequency of the speaker to be tested is generally between 50-800hz, and therefore, the natural frequency of the testing device in the vertical direction is preferably less than 12.5hz, and the natural frequency of the testing device in other directions is preferably less than 5hz. That is, the application limits the natural frequency and the stiffness of the elastic element to ensure that the speaker to be tested is in a free state and to reduce the interference of the natural frequency of the testing device on the force test of the speaker to be tested.

[0029] In addition, the testing device further comprises a bolt (not shown in the figure) for fixedly supporting the speaker to be tested on the carrier 1011. Specifically, the bolt can be positioned above the carrier to support the speaker to be tested, or the bolt can be positioned on both sides of the carrier 100 to support the speaker to be tested.

[0030] In an embodiment, the at least one acceleration sensor 102 comprises a first acceleration sensor 1021 fixed to the vertical central axis of the speaker to be tested, and the processing module 103 is configured to determine the acceleration of the speaker to be tested in each coordinate axis direction in a preset three-dimensional coordinate system based on the acceleration measured by the first acceleration sensor 1021, and to obtain the force of the speaker to be tested in each coordinate axis direction in the preset three-dimensional coordinate system based on the acceleration of the speaker to be tested, the mass of the speaker to be tested and the mass of the fixing device.

[0031] In the embodiment, the first acceleration sensor 1021 can be arranged on the carrier 1011 in the fixing device 101, or can be arranged on the speaker to be tested, as long as it is arranged on the vertical central axis of the speaker to be tested. At this time, the processing module 103 can directly determine the force of the speaker to be tested in each direction based on the acceleration values of each coordinate axis direction measured by the first acceleration sensor.

[0032] Specifically, if the center position of the speaker under test is taken as the origin, and the vertical direction is taken as the z-axis, with the x-axis and y-axis all perpendicular to the z-axis, a three-dimensional coordinate system is established. The forces acting in the x, y, and z directions are calculated according to the following formula: F = (m1 + m2)a. In this formula, F is the force acting on the speaker under test, m1 is the mass of the fixing device 101, m2 is the mass of the speaker under test, and a is the acceleration. That is, the processing module 103 can select any one of the first acceleration sensors 1021 to obtain its measured x-axis acceleration, y-axis acceleration, and z-axis acceleration. The force acting on the speaker under test can then be obtained according to the above formula.

[0033] Of course, the accelerometer may not be placed on the vertical centerline of the speaker under test. In this case, the acceleration value obtained by the accelerometer is not the acceleration of the speaker under test. It is necessary to convert the acceleration value measured by the sensor into the acceleration of the speaker under test based on the position of the accelerometer, the center position of the speaker under test, and the force conversion relationship between the two positions.

[0034] In one embodiment, at least one acceleration sensor 102 further includes a second acceleration sensor 1022 fixed on the vertical central axis of the speaker not under test; the processing module 103 is further configured to obtain the centripetal force of the speaker under test rotating around the vertical central axis based on the acceleration measured by the first acceleration sensor 1021 in each coordinate axis direction and the acceleration difference between the second acceleration sensor 1022 in each coordinate axis direction measured in the same coordinate system, the distance between the first acceleration sensor 1021 and the second acceleration sensor 1022, and the moment of inertia of the speaker under test and the fixing device 101 about the vertical central axis respectively.

[0035] Specifically, such as Figure 2 As shown, the second acceleration sensor 1022 can be disposed on the side of the speaker under test, or on the edge of the support frame 1011 in the fixing device 101, as long as it is not disposed on the vertical central axis. The centripetal force of the speaker under test is obtained by the following formula:

[0036] T=(J1+J2)θ

[0037] θ=(a B -a A ) / r

[0038] Where T is the centripetal force of the speaker under test, J1 is the moment of inertia of the fixing device about the central axis, J2 is the moment of inertia of the speaker under test about the central axis, θ is the angular acceleration, and a A a is the acceleration value collected by the first accelerometer. B The acceleration value is collected by the second accelerometer, and r is the distance between the first and second accelerometers. Specifically, since the calculation is of centripetal force, aA and a B The acceleration value cannot be in the vertical direction, and can be in any direction in the plane, such as an x-direction acceleration value or a y-direction acceleration value.

[0039] The embodiment fixes the carrier on the base through the elastic element, so that the entire test device constitutes a vibration system, and then sets the relationship among the rigidity of the elastic element, the natural frequency of the test device, and the signal frequency of the to-be-tested sound box, so that the test device can ensure that the to-be-tested sound box is in a free state and can reduce the interference of the natural frequency of the test device on the force test of the to-be-tested sound box.

[0040] The embodiment of the application relates to a sound box force test method applied to the test device as described in the above embodiment, as shown in the figure, comprising. Figure 3 As shown in the figure, comprising.

[0041] In step 201, when the to-be-tested sound box is placed on the test device and the to-be-tested sound box is in a working state, the acceleration measured by at least one acceleration sensor in the test device is obtained.

[0042] In step 202, the acceleration of the to-be-tested sound box is determined according to the acceleration measured by the at least one acceleration sensor, and the force acting on the to-be-tested sound box is obtained according to the acceleration of the to-be-tested sound box, the mass of the to-be-tested sound box, and the mass of the fixing device.

[0043] Specifically, when the test device comprises a first acceleration sensor fixed on the vertical central axis of the to-be-tested sound box, the acceleration of the to-be-tested sound box in each coordinate axis direction in a preset three-dimensional coordinate system is determined according to the acceleration measured by the first acceleration sensor, and the force acting on the to-be-tested sound box in each coordinate axis direction in the preset three-dimensional coordinate system is obtained according to the acceleration of the to-be-tested sound box, the mass of the to-be-tested sound box, and the mass of the fixing device.

[0044] If the center position of the to-be-tested sound box is taken as the origin, the vertical direction is taken as the z-axis, and the x-axis and the y-axis are perpendicular to the z-axis to establish a three-dimensional coordinate system, wherein the forces in the x, y, and z directions are calculated according to the following formula: F=(m1+m2)a. In the formula, F is the force of the to-be-tested sound box, m1 is the mass of the fixing device 101, m2 is the mass of the to-be-tested sound box, and a is the acceleration. That is, any first acceleration sensor 1021 is selected to obtain the measured x-direction acceleration, y-direction acceleration, and z-direction acceleration, and the force of the to-be-tested sound box can be obtained according to the above formula.

[0045] When the testing device further comprises a second acceleration sensor fixed on the vertical central axis of the non-speaker to be tested, the centripetal force of the speaker to be tested is obtained according to the acceleration difference between the acceleration in each coordinate axis direction measured by the first acceleration sensor and the acceleration in each coordinate axis direction measured by the second acceleration sensor in the same coordinate system, the distance between the first acceleration sensor and the second acceleration sensor, the moment of inertia of the speaker to be tested and the fixing device around the vertical central axis, respectively.

[0046] The centripetal force of the speaker to be tested is obtained by the following formula:

[0047] T = (J1 + J2) θ

[0048] θ = (a B -a A ) / r

[0049] Wherein, T is the centripetal force of the speaker to be tested, J1 is the moment of inertia of the fixing device around the central axis, J2 is the moment of inertia of the speaker to be tested around the central axis, θ is the angular acceleration, a A is the acceleration value collected by the first acceleration sensor, a B is the acceleration value collected by the second acceleration sensor, and r is the distance between the first acceleration sensor and the second acceleration sensor. Specifically, since the centripetal force is calculated, a A and a B cannot be the acceleration value in the vertical direction, but can be the acceleration value in any direction on the plane, such as the acceleration value in the x direction or the acceleration value in the y direction.

[0050] The speaker force testing method provided by the embodiment of the application can obtain the action force of the speaker to be tested by obtaining the acceleration of the speaker to be tested, the mass of the speaker to be tested and the mass of the fixing device in reverse calculation, when the speaker to be tested is in a free state without action force or the resultant force of the action force is zero in a non-working state. The action force in multiple directions can be obtained by one test, which is fast and accurate, and ensures the synchronicity of the data in each direction.

[0051] The step division of the above various methods is only for clear description, and can be combined into one step or split into multiple steps in implementation, as long as the same logical relationship is included, which is within the protection scope of the patent; adding insignificant modifications or introducing insignificant designs in the algorithm or process, but not changing the core design of the algorithm and process, are within the protection scope of the patent.

[0052] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A speaker stress testing device, characterized in that, include: A fixed device, at least one acceleration sensor, and a processing module; The fixing device is used to support the speaker under test, so that the speaker under test is in a free state when it is not in operation; The at least one acceleration sensor is fixed to the fixing device and / or the speaker under test carried by the fixing device, and is used to obtain the acceleration of each acceleration sensor when the speaker under test is in working state; The processing module is connected to the acceleration sensor and is used to determine the acceleration of the speaker under test based on the acceleration of each acceleration sensor, and to obtain the force acting on the speaker under test based on the acceleration of the speaker under test, the mass of the speaker under test, and the mass of the fixing device. The fixing device includes: a support frame, an elastic element, and a base; the support frame is fixed to the base in a free state by the elastic element, and the speaker under test is fixed to the support frame; The stiffness of the elastic element is set according to the signal frequency of the speaker under test.

2. The speaker force testing device according to claim 1, characterized in that, The at least one acceleration sensor includes: a first acceleration sensor fixed on the vertical central axis of the speaker under test; The processing module is used to determine the acceleration measured by the first accelerometer in each coordinate axis direction in the preset three-dimensional coordinate system as the acceleration of the speaker under test, and to obtain the force exerted by the speaker under test in each coordinate axis direction in the preset three-dimensional coordinate system based on the acceleration of the speaker under test, the mass of the speaker under test, and the mass of the fixing device.

3. The speaker stress testing device according to claim 2, characterized in that, The at least one acceleration sensor further includes: a second acceleration sensor fixed on the vertical central axis other than the speaker under test; The processing module is further configured to obtain the centripetal force of the speaker under test when it rotates around the vertical central axis based on the acceleration difference between the acceleration measured by the first accelerometer in each coordinate axis direction and the acceleration measured by the second accelerometer in each coordinate axis direction in the same coordinate system, the distance between the first accelerometer and the second accelerometer, and the moments of inertia of the speaker under test and the fixing device about the vertical central axis respectively.

4. The speaker stress testing device according to any one of claims 1-3, wherein the at least one acceleration sensor is fixed to the fixing device and / or the speaker under test supported by the fixing device by any of the following methods: magnetic element, clip, and glue.

5. The speaker force testing device according to claim 1, characterized in that, The stiffness of the elastic element is positively correlated with the natural frequency and mass of the speaker stress testing device; The natural frequency of the speaker force testing device in the vertical direction is less than 1 / 4 of the frequency of the signal emitted by the speaker under test; The natural frequencies of the testing device in all directions except the vertical direction are less than 1 / 10 of the frequency of the signal emitted by the speaker under test.

6. The speaker force testing device according to claim 1, characterized in that, It also includes bolts, by which the speaker under test is fixed to the support frame.

7. A method for testing the force on a speaker, characterized in that, The speaker stress testing apparatus applied to any one of claims 1-6, the method comprising: When the speaker under test is placed on the testing device and the speaker under test is in working condition, the acceleration measured by at least one acceleration sensor in the testing device is obtained. The acceleration of the speaker under test is determined based on the acceleration measured by the at least one acceleration sensor, and the force acting on the speaker under test is obtained based on the acceleration of the speaker under test, the mass of the speaker under test, and the mass of the fixing device.

8. The speaker stress testing method according to claim 7, characterized in that, The step of determining the acceleration of the speaker under test based on the acceleration measured by the at least one acceleration sensor, and obtaining the force acting on the speaker under test based on the acceleration of the speaker under test, the mass of the speaker under test, and the mass of the fixing device, includes: When the testing device includes a first accelerometer fixed on the vertical central axis of the speaker under test, the acceleration measured by the first accelerometer in each coordinate axis direction in the preset three-dimensional coordinate system is determined as the acceleration of the speaker under test, and the force exerted by the speaker under test in each coordinate axis direction in the preset three-dimensional coordinate system is obtained based on the acceleration of the speaker under test, the mass of the speaker under test, and the mass of the fixing device.

9. The speaker stress testing method according to claim 8, characterized in that, The step of obtaining the force exerted by the speaker under test in each direction based on the acceleration collected in each direction by the at least one acceleration sensor includes: When the testing device further includes a second accelerometer fixed on a vertical central axis other than that of the speaker under test, the centripetal force of the speaker under test when rotating around the vertical central axis is obtained based on the acceleration difference between the acceleration measured by the first accelerometer in each coordinate axis direction and the acceleration measured by the second accelerometer in each coordinate axis direction in the same coordinate system, the distance between the first accelerometer and the second accelerometer, and the moments of inertia of the speaker under test and the fixing device about the vertical central axis, respectively.

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